Monkey-wrench.



P. H. BURGART.

MONKEY WRENCH. 5 APPLICATION FILED AUG. 26, 1911 Patented J an. 9,1912.

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PHILIP I'I. BURGART, OF CHICAGO, ILLINOIS.

MONKEY-WRENCH.

Specification of Letters Patent.

Patented Jan. 9, 1912.

Application filed August 26, 1911. Serial No. 646,167.

To all whom it may concern Be it known that I, PHILIP H. BURGART, acitizen of the United States, and a resident of the city of Chicago,county of Cook, and State of Illinois, have invented certain new anduseful Improvements in -Monkey- WVrenches, of which the following is aspecification.

My invention relates to improvements in monkey wrenches and has for itsobject the production of a wrench of this character which will be sodesigned as to be adapted for ready and expeditious adjustment in use.

A further object is the production of a monkey wrench which will be ofdurable and economical construction and efficient in operation.

Other objects will appear hereinafter.

'With these objects in view my invention consists in the combinationsand arrangements of parts hereinafter described and claimed.

My invention will be best understood by reference to the accompanyingdrawing forming a part of this specification, and in which,

Figure 1 is a side elevation of a monkey wrench embodying my invention,Fig. 2 is a slightly enlarged transverse section taken on line wm ofFig. 1, and Fig. 3 is a fragmentary section taken on line y-y of Fig. 2.

The preferred form of construction as illustrated in the drawingcomprises a shank 1 provided at one end with the stationary jaw 2 and atits other end with the handle 3. The shank 1 is screwthreaded atopposite sides 4, the remaining opposite sides of said shank beingflattened or cut away as clearly shown in Fig. 2. Slidably mounted uponthe shank 1 is the movable jaw 5, said jaw being provlded with adepending extension 6 which terminates at its lower end in a strap orloop 7 which slidably embraces said shank in the same manner as said jaw5.

Arranged below the portion 7 of the jaw 5 is the nut 8, the interior ofsaid nut being threaded at opposite sides to correspond with thethreaded portions of said shank, as clearly shown in Fig. 2. Thearrangement is such, as will be observed, that in one position of saidnut as shown in the several figures the threaded portions of said nutwill be in engagement with the threaded portions of said shank, turningof said nut through 90 degrees disengaging said threaded portions topermit of free sliding of said nut upon said shank. Said nut 8 isprovided adjacent its upper end with a circumferential groove 9 which isloosely engaged by an inwardly projecting lug 10 formed at the lowerextremity of the extension 6. Said lug and groove evidently serve toestablish an operative connection between the nut 8 and the movable jaw5 so that the same will move in unison, said groove being of such alength however, as

to permit of rotary movement of said nut a suflicient distance to effectengagement or disengagement of the threaded portions of said nut 8 andshank. Also formed in one side of the nut 8 is a longitudinally eX-tending groove 11. Arranged in the groove 11 is a leaf spring 12 thelower end of which is securely fastened in said nut by means of an ear13 bent over the same. The opposite end of said spring is free formovement in said groove 11 which is formed as shown to permit of suchmovement of said spring, outward movement of the latter being limitedhowever by an ear 14 which is formed upon the nut 8 at the upper end ofsaid groove. Formed in the lug 10 is a notch 15 adapted for engagementby the free end of the spring 12 to serve in cooperation with saidspring to lock the nut 8 against rotary movement. The notch 15 .is sopositioned,however, that when the spring 12 is in engagement therewith,the threaded portions of said nut will be in engagement with thethreaded portions of said shank and so that engagement of said springwith said notch will serve to lock the nut8 in positions of threadedengagement thereof with the shank 1. The central portion ofthe spring 12is bent outwardly as shown so that the same may be readily engaged bythe finger to effect depression of the free end thereof for releasingthe nut 8 when desired.

In operation whenit is desired to set the jaws of the wrench at adefinite distance so as to grasp an object, the nut is turned until theunthreaded portions therein register with the threaded portions of theshank, the circumferential groove 9 in said nut permitting of suchmovement of said nut without affecting the movable jaw 5. The nut andmovable jaw are then pushed toward the stationary jaw the desireddistance, this being expeditiously done since the parts will slidefreely over the threads of the shank. The nut is now turned until itsthreads engage the threads of the shank, causing the movable jaw totightly grasp the object which it is desired to clamp. hen the nut 8 isturned as last named the spring 12 will engage the notch 15 thereof tolock said nut and hence the movable jaw 5 in adjusted position. When itis desired to release the jaw, a slight retrograde turn of the nut willeffect the unlocking of the parts or the dis-' engagement of the threadsthereof and permit of a quick and easy backward movement of the movablejaw and nut, when they may be set as before.

A monkey wrench of the construction set forth is durable and economicaland the same is of high efficiency in use.

While I have illustrated and described the preferred form ofconstruction for carrying my invention into effect, this is capable ofvariation and modification without departing from the spirit of theinvention. I, therefore, do not wish to be limited to the precisedetails of construction set forth, but desire to avail myself of suchvariations and modifications as come within the scope of the appendedclaims.

Having describedmy invention what I claim as new and desire to secure byLetters Patent is:

1. A monkey wrench comprising the usual jaws; a shank threaded upon twoof its sides; a nut threaded to correspond with said shank to permit oflongitudinal sliding of said nut upon said shank when disengaged fromthe threads of said shank, said nut having a circumferential grooveformed thereinfor the reception of a lug upon the movable jaw; alongitudinal groove in said nut; and a spring catch releasable bydepression in said longitudinal groove engaging said lug of said movablejaw for locking said nut in positions of engagement with the threads ofsaid shank, substantially as described.

2. A monkey wrench comprising the usual jaws; a, shank threaded upon twoof its sides; a nut threaded to correspond with said shank to permit oflongitudinal sliding of said nut upon said shank when disengaged fromthe threads of said shank, said nut having a circumferential grooveformed thereinfor the reception of a lug upon the movable jaw; alongitudinal groove in said nut; and a leaf spring catch releasable bydepression arranged in said longitudinal groove and having one endsecured to said nut, the free end of said catch being adapted to engagea notch in said movable jaw to lock said nut in posit-ions of engagementof said nut with the threads of said shank, substantially as described.

3. A monkey wrench comprising the usual. jaws; a shank threaded upon twoof its sides; a nut threaded to correspond. with said shank to permit oflongitudinal sliding of said nut upon said shank when disengaged fromthe threads of said shank, said 4 nut having a circumferential grooveformed therein for the reception of a lug upon the movable jaw; alongitudinal groove in said nut; and a leaf spring catch releasable bydepression arranged in said longitudinal groove and having one endsecured to said nut, the free end of said catch being adapted to engagea notch in said lug .of said movable jaw for locking said nut inpositions of engagement with the threads of said shank, said catch beingformed for manual engagement to effect depression thereof, substantiallyas described.

4. A monkey wrench comprising the usual jaws; a shank threaded upon twoof its sides; anut threaded to correspond with said shank to permit oflongitudinal sliding of said nut upon said shank when disengaged fromthe threads of said shank, said nut having a circumferential grooveformed therein for the reception of a lug upon the movable jaw; alongitudinal groove in said nut; a leaf spring arranged in saidlongitudinal groove and having one end secured to said nut, the free endof said spring being adapted to engage a notch in said lug of saidmovable jaw for locking said nut in positions of engagement with thethreads of said shank, said spring being formed for manual depression toeffect the release of said nut; and means for limiting the outwardmovement of the free end of said spring, substantially as described.

5. A monkey wrench comprising the usual jaws; a shank threaded upon twoof its sides; a nut threaded. to correspond with said shank to permit oflongitudinal sliding of said nut upon said shank when disengaged fromthe threads of said shank, said nut having a circumferential grooveformed therein for the reception of a lug upon the movable jaw; alongitudinal groove in said nut; and a leaf spring arranged in saidlongitudinal groove and having one end secured to said nut, the free endof said spring being adapted to engage a notch in said lug of saidmovable jaw for locking said nut in positions of engagement with thethreads of said shank, the central portion of said spring being bentoutwardly for manual depression of the free end thereof to effect therelease of said nut, substantially as described.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

PHILIP H. BURGART.

Witnesses:

' ARTUHR A. OLSON, HELEN F. LILLIs.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents,

A Washington, D. C.

